Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5147489 | Coloured images | John V. Shepherd | 1992-09-15 |
| 4389473 | Production of transfer material | William F. Marwick, David R. Wilson | 1983-06-21 |
| 4254211 | Production of transfer material | William F. Marwick, David R. Wilson | 1981-03-03 |
| 4234673 | Manufacture of signs using photoimaging and heat transfer | John V. Shepherd, John S. Thornley, Eric M. Sutton | 1980-11-18 |